Ball-bearing shears.



Patented Apr. I6, I90I.

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UNITED STATES PATENT OEE-ICE.

LEROY A. WILLIAMSON, OF WEST CORNWALL, CONNECTICUT.

-BALL-BEARING SHEAIRS.

SPECIFICATION forming; part of Letters Patent No. 672,050, dated April16, 1901.

Application mea July 5.1900.

To all whom, t may oon/cern:

Be it known that I, LEROY-A. WILLIAMSON, a citizen of the United Statesof America, having residence and post-office address at West Cornwall,in the county of Litchfield and State of Connecticut, have invented acertain new and useful Improvement in Ball-Bearing- Shears, of which thefollowing is a description, reference being had to the accompanyingdrawings, wherein- 1 Figure ,l is a side view of a pair of shearsembodying the said improvement. Fig. 2 is a view of the same shears incross-section on the plane denoted by the dotted line :r of Fig. 1, thescale being enlarged as compared with Fig. l. Fig.`3 is a side view, onascale similar to that of Fig. 2, of a portion of the shear-half which isnext the observer in Fig. l with the pivot-screw absent. Fig. 4c is aview, on a scale similar -to that of Fig. 2, of a portion of the innerface of that shear-half which is underneath in Fig. 2 with thepivotscrew absent.

The object of the improvement is the production of ball-bearing shears.

In the accompanying drawings the letter a denotes one of theshear-halves, b denotes an interiorly-screw-threaded pivot-hole throughthe same, c denotes a ball-race surrounding said pivot-hole, and ddenotes the balls contained therein. By preference the pivot-holeandvball-race just referred to are made in a piece separate from theshear-half, which piece is tightly forced into a correspondinglyshapedorifice in that shear-half. The letter e denotes the other shear-half,and e denotes an interiorly-screw-threaded pivot-plate hole therein.

The letter f denotes the eXteriorly-screwthreaded pivot-plate whichscrews into the hole e', it being provided with Spanner-mortises f forthat purpose. The pivot-plate f contains the Unthreaded pivot-hole f2,and it also contains the larger ball-race g, surrounding the outer endof the same. The ball-race is sunken considerably below the outer surface of the pivot-plate in order to give place for the head of thepivot-screw h. The pivotscrew is threaded into the shear-half a andholds the two shear-halves together and, as

Serial No. 22,567. (No model.)

its name indicates, is the pivot on which they turn. The under side ofthe head of that screw bears upon the balls i which are contained in theball-race g. The inner side of the pivot-plate hasa surface which bearsupon the balls d.

The closeness of fit of the two shear-halves to each other is determinedby adjusting the `pivot-plate in the pivot-plate hole.

It claim as my improvementl. In combination; the shear-half having thescrew-threaded pivot-hole and the ballrace surrounding the saidpivot-hole; the balls carried in the ball-race last mentioned; the othershear-half having the screw-threaded pivot-plate hole; theeXteriorly-threaded pivot-plate having the sunken ball-race, theunthreaded pivot-hole, and the surface adapted to bear on the ballsiirst mentioned; the balls carried in said sunken ball-race; and theheaded screw having its tip threaded into the threaded pivot-hole insaid rst-mentioned shear-half and its body loosely iitting saidunthreaded pivot-hole and bearing by the under side of its head on theballs last mentioned; all substantially as described and for thepurposes set forth.

2. In combination; the shear-half having the screwthreaded pivot hole;the piece forced into said shear-half and having the unthrea'dedpivot-hole and the ball-race surrounding the said pivot-hole; the ballscarried in the ball-race last mentioned; the other shear-half havingthescrew-threaded pivotplate hole; the exteriorly threaded pivotplatehaving the sunken ball-race, the unthreaded pivot-hole, and the surfaceadapted to bear on the balls first mentioned; the balls carried in saidsunken ball-race; and the headed screw having its tip threaded into thethreaded pivot-hole in said Iirst-mentioned shear-half and its bodyloosely fitting said unthreaded pivot-holes and bearing by the underside of its head on the balls last mentioned; all substantially asdescribed and for the purpose set forth.

LEROY A. WILLIAMSON. Witnesses:

WILLIAM D. BosLER, KATHRINE N. SALEWSKI.

